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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz, a Integrated Development Environment for

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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.

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#

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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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# See COPYING file for copyrights details.

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public License

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# as published by the Free Software Foundation; either version 2

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# of the License, or (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program; if not, write to the Free Software

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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from math import *

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import wx

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from graphics.ToolTipProducer import ToolTipProducer

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from graphics.DebugDataConsumer import DebugDataConsumer

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# -------------------------------------------------------------------------------

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#                               Common constants

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#

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#            Definition of constants for dimensions of graphic elements

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# -------------------------------------------------------------------------------

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# FBD and SFC constants

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MIN_MOVE = 5                            # Minimum move before starting a element dragging

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CONNECTOR_SIZE = 8                      # Size of connectors

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BLOCK_LINE_SIZE = 20                    # Minimum size of each line in a block

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HANDLE_SIZE = 6                         # Size of the squares for handles

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ANCHOR_DISTANCE = 5                     # Distance where wire is automativally attached to a connector

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POINT_RADIUS = 2                        # Radius of the point of wire ends

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MIN_SEGMENT_SIZE = 2                    # Minimum size of the endling segments of a wire

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# LD constants

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LD_LINE_SIZE = 40                       # Distance between two lines in a ladder rung

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LD_ELEMENT_SIZE = (21, 15)              # Size (width, height) of a ladder element (contact or coil)

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LD_WIRE_SIZE = 30                       # Size of a wire between two contact

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LD_WIRECOIL_SIZE = 70                   # Size of a wire between a coil and a contact

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LD_POWERRAIL_WIDTH = 3                  # Width of a Powerrail

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LD_OFFSET = (10, 10)                    # Distance (x, y) between each comment and rung of the ladder

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LD_COMMENT_DEFAULTSIZE = (600, 40)      # Size (width, height) of a comment box

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# SFC constants

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SFC_STEP_DEFAULT_SIZE = (40, 30)        # Default size of a SFC step

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SFC_TRANSITION_SIZE = (20, 2)           # Size of a SFC transition

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SFC_DEFAULT_SEQUENCE_INTERVAL = 40      # Default size of the interval between two divergence branches

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SFC_SIMULTANEOUS_SEQUENCE_EXTRA = 20    # Size of extra lines for simultaneous divergence and convergence

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SFC_JUMP_SIZE = (12, 13)                # Size of a SFC jump to step

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SFC_WIRE_MIN_SIZE = 25                  # Size of a wire between two elements

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SFC_ACTION_MIN_SIZE = (100, 30)         # Minimum size of an action block line

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# Type definition constants for graphic elements

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[INPUT, OUTPUT, INOUT] = list(range(3))

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[CONNECTOR, CONTINUATION] = list(range(2))

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[LEFTRAIL, RIGHTRAIL] = list(range(2))

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[CONTACT_NORMAL, CONTACT_REVERSE, CONTACT_RISING, CONTACT_FALLING] = list(range(4))

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[COIL_NORMAL, COIL_REVERSE, COIL_SET, COIL_RESET, COIL_RISING, COIL_FALLING] = list(range(6))

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[SELECTION_DIVERGENCE, SELECTION_CONVERGENCE, SIMULTANEOUS_DIVERGENCE, SIMULTANEOUS_CONVERGENCE] = list(range(4))

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# Constants for defining the type of dragging that has been selected

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[HANDLE_MOVE, HANDLE_RESIZE, HANDLE_POINT, HANDLE_SEGMENT, HANDLE_CONNECTOR] = list(range(5))

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# List of value for resize handle that are valid

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VALID_HANDLES = [(1, 1), (1, 2), (1, 3), (2, 3), (3, 3), (3, 2), (3, 1), (2, 1)]

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# Contants for defining the direction of a connector

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[EAST, NORTH, WEST, SOUTH] = [(1, 0), (0, -1), (-1, 0), (0, 1)]

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# Contants for defining which mode is selected for each view

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[MODE_SELECTION, MODE_BLOCK, MODE_VARIABLE, MODE_CONNECTION, MODE_COMMENT,

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 MODE_COIL, MODE_CONTACT, MODE_POWERRAIL, MODE_INITIALSTEP, MODE_STEP,

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 MODE_TRANSITION, MODE_DIVERGENCE, MODE_JUMP, MODE_ACTION, MODE_MOTION] = list(range(15))

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# Contants for defining alignment types for graphic group

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[ALIGN_LEFT, ALIGN_CENTER, ALIGN_RIGHT, ALIGN_TOP, ALIGN_MIDDLE, ALIGN_BOTTOM] = list(range(6))

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# Contants for defining which drawing mode is selected for app

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[FREEDRAWING_MODE, DRIVENDRAWING_MODE] = [1, 2]

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# Color for Highlighting

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HIGHLIGHTCOLOR = wx.CYAN

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# Define highlight types

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ERROR_HIGHLIGHT = (wx.Colour(255, 255, 0).GetIM(), wx.RED.GetIM())

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SEARCH_RESULT_HIGHLIGHT = (wx.Colour(255, 165, 0).GetIM(), wx.WHITE.GetIM())

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# Define highlight refresh inhibition period in second

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REFRESH_HIGHLIGHT_PERIOD = 0.1

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HANDLE_CURSORS = {

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    (1, 1): 2,

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    (3, 3): 2,

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    (1, 3): 3,

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    (3, 1): 3,

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    (1, 2): 4,

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    (3, 2): 4,

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    (2, 1): 5,

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    (2, 3): 5

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}

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def round_scaling(x, n, constraint=0):

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    fraction = x / n

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    if constraint == -1:

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        xround = int(fraction)

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    else:

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        xround = round(fraction)

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        if constraint == 1 and xround < fraction:

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            xround += 1

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    return int(xround * n)

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# -------------------------------------------------------------------------------

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# Basic vector operations for calculate wire points

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# -------------------------------------------------------------------------------

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def vector(p1, p2, normal=True):

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    """

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    Create a vector from two points and define if vector must be normal

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    """

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    vector = (p2.x - p1.x, p2.y - p1.y)

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    if normal:

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        return normalize(vector)

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    return vector

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def norm(v):

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    """

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    Calculate the norm of a given vector

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    """

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    return sqrt(v[0] * v[0] + v[1] * v[1])

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def normalize(v):

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    """

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    Normalize a given vector

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    """

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    v_norm = norm(v)

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    # Verifie if it is not a null vector

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    if v_norm > 0:

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        return (v[0] / v_norm, v[1] / v_norm)

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    else:

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        return v

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def is_null_vector(v):

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    """

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    Calculate the scalar product of two vectors

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    """

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    return v == (0, 0)

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def add_vectors(v1, v2):

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    """

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    Calculate the scalar product of two vectors

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    """

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    return (v1[0] + v2[0], v1[1] + v2[1])

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def product(v1, v2):

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    """

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    Calculate the scalar product of two vectors

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    """

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    return v1[0] * v2[0] + v1[1] * v2[1]

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def GetScaledEventPosition(event, dc, scaling):

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    """

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    Function that calculates the nearest point of the grid defined by scaling for the given point

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    """

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    pos = event.GetLogicalPosition(dc)

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    if scaling:

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    return pos

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def DirectionChoice(v_base, v_target, dir_target):

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    """

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    Function that choose a direction during the wire points generation

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    """

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    dir_product = product(v_base, v_target)

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    if dir_product < 0:

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        return (-v_base[0], -v_base[1])

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    elif dir_product == 0 and product(v_base, dir_target) != 0:

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        return dir_target

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    return v_base

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def MiterPen(colour, width=1, style=wx.SOLID):

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    pen.SetJoin(wx.JOIN_MITER)

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    pen.SetCap(wx.CAP_PROJECTING)

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    return pen

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# -------------------------------------------------------------------------------

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#                    Helpers for highlighting text

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# -------------------------------------------------------------------------------

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def AddHighlight(highlights, infos):

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    RemoveHighlight(highlights, infos)

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    highlights.append(infos)

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def RemoveHighlight(highlights, infos):

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    if infos in highlights:

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        highlights.remove(infos)

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        return True

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    return False

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def ClearHighlights(highlights, highlight_type=None):

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    if highlight_type is not None:

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        return [highlight for highlight in highlights if highlight[2] != highlight_type]

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    return []

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def DrawHighlightedText(dc, text, highlights, x, y):

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    current_pen = dc.GetPen()

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    dc.SetPen(wx.TRANSPARENT_PEN)

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    for start, end, highlight_type in highlights:

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        dc.SetBrush(wx.Brush(highlight_type[0]))

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        offset_width, _offset_height = dc.GetTextExtent(text[:start[1]])

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        part = text[start[1]:end[1] + 1]

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        part_width, part_height = dc.GetTextExtent(part)

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        dc.DrawRectangle(x + offset_width, y, part_width, part_height)

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        dc.SetTextForeground(highlight_type[1])

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        dc.DrawText(part, x + offset_width, y)

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    dc.SetPen(current_pen)

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    dc.SetTextForeground(wx.BLACK)

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# -------------------------------------------------------------------------------

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#                           Graphic element base class

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# -------------------------------------------------------------------------------

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class Graphic_Element(ToolTipProducer):

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    """

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    Class that implements a generic graphic element

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    """

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    # Create a new graphic element

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    def __init__(self, parent, id=None):

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        ToolTipProducer.__init__(self, parent)

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        self.Parent = parent

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        self.Id = id

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        self.oldPos = None

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        self.StartPos = None

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        self.CurrentDrag = None

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        self.Handle = (None, None)

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        self.Dragging = False

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        self.Selected = False

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        self.Highlighted = False

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        self.Pos = wx.Point(0, 0)

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        self.Size = wx.Size(0, 0)

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        self.BoundingBox = wx.Rect(0, 0, 0, 0)

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        self.Visible = False

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    def GetDefinition(self):

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        return [self.Id], []

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    def TestVisible(self, screen):

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        self.Visible = self.Selected or self.GetRedrawRect().Intersects(screen)

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    def IsVisible(self):

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        return self.Visible

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    def SpreadCurrent(self):

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        pass

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    def GetConnectorTranslation(self, element):

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        return {}

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    def FindNearestConnector(self, position, connectors):

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        distances = []

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        for connector in connectors:

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            connector_pos = connector.GetRelPosition()

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            distances.append((sqrt((self.Pos.x + connector_pos.x - position.x) ** 2 +

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                                   (self.Pos.y + connector_pos.y - position.y) ** 2),

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                              connector))

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        distances.sort(key=lambda n: n[0])

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        if len(distances) > 0:

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            return distances[0][1]

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        return None

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    def IsOfType(self, type, reference):

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        return self.Parent.IsOfType(type, reference)

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    def IsEndType(self, type):

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        return self.Parent.IsEndType(type)

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    def GetDragging(self):

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        return self.Dragging

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    # Make a clone of this element

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    def Clone(self, parent):

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        return Graphic_Element(parent, self.Id)

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    # Changes the block position

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    def SetPosition(self, x, y):

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        self.RefreshConnected()

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        self.RefreshBoundingBox()

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    # Returns the block position

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    def GetPosition(self):

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        return self.Pos.x, self.Pos.y

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    # Changes the element size

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    def SetSize(self, width, height):

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        self.RefreshConnectors()

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        self.RefreshBoundingBox()

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    # Returns the element size

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    def GetSize(self):

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        return self.Size.GetWidth(), self.Size.GetHeight()

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    # Returns the minimum element size

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    def GetMinSize(self):

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        return 0, 0

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    # Set size of the element to the minimum size

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    def SetBestSize(self, scaling, x_factor=0.5, y_factor=0.5):

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        width, height = self.GetSize()

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        posx, posy = self.GetPosition()

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        min_width, min_height = self.GetMinSize()

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        if width < min_width:

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            self.Pos.x = max(0, self.Pos.x - (width - min_width) * x_factor)

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            width = min_width

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        if height < min_height:

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            self.Pos.y = max(0, self.Pos.y - (height - min_height) * y_factor)

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            height = min_height

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        if scaling is not None:

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            self.Pos.x = round_scaling(self.Pos.x, scaling[0])

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            self.Pos.y = round_scaling(self.Pos.y, scaling[1])

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            width = round_scaling(width, scaling[0], 1)

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            height = round_scaling(height, scaling[1], 1)

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        self.SetSize(width, height)

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        return self.Pos.x - posx, self.Pos.y - posy

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    # Refresh the element connectors position

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    def RefreshConnectors(self):

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        pass

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    # Refresh the position of wires connected to element inputs and outputs

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    def RefreshConnected(self, exclude=None):

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        pass

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   369

    # Change the parent

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    def SetParent(self, parent):

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        self.Parent = parent

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    # Override this method for defining the method to call for deleting this element

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    def Delete(self):

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        pass

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    # Returns the Id

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    def GetId(self):

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        return self.Id

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   381

    # Returns if the point given is in the bounding box

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    def HitTest(self, pt, connectors=True):

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        if connectors:

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            rect = self.BoundingBox

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        else:

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            rect = wx.Rect(self.Pos.x, self.Pos.y, self.Size[0], self.Size[1])

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        return rect.Contains(pt.x, pt.y)

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    # Returns if the point given is in the bounding box

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    def IsInSelection(self, rect):

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        return rect.Contains(self.BoundingBox.x, self.BoundingBox.y) and rect.Contains(self.BoundingBox.x + self.BoundingBox.width, self.BoundingBox.y + self.BoundingBox.height)

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    # Override this method for refreshing the bounding box

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    def RefreshBoundingBox(self):

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        pass

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    # Returns the bounding box

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    def GetBoundingBox(self):

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        return self.BoundingBox

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    # Returns the RedrawRect

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    def GetRedrawRect(self, movex=0, movey=0):

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        scalex, scaley = self.Parent.GetViewScale()

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        rect = wx.Rect()

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        rect.x = self.BoundingBox.x - int(HANDLE_SIZE / scalex) - 3 - abs(movex)

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        rect.y = self.BoundingBox.y - int(HANDLE_SIZE / scaley) - 3 - abs(movey)

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        rect.width = self.BoundingBox.width + 2 * (int(HANDLE_SIZE / scalex) + abs(movex) + 1) + 4

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        rect.height = self.BoundingBox.height + 2 * (int(HANDLE_SIZE / scaley) + abs(movey) + 1) + 4

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        return rect

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    def Refresh(self, rect=None):

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        if self.Visible:

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            if rect is not None:

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                self.Parent.RefreshRect(self.Parent.GetScrolledRect(rect), False)

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            else:

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                self.Parent.RefreshRect(self.Parent.GetScrolledRect(self.GetRedrawRect()), False)

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   418

    # Change the variable that indicates if this element is selected

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    def SetSelected(self, selected):

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        self.Selected = selected

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        self.Refresh()

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    # Change the variable that indicates if this element is highlighted

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    def SetHighlighted(self, highlighted):

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        self.Highlighted = highlighted

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        self.Refresh()

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   428

    # Test if the point is on a handle of this element

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    def TestHandle(self, event):

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        dc = self.Parent.GetLogicalDC()

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        scalex, scaley = dc.GetUserScale()

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        pos = event.GetPosition()

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        pt = wx.Point(*self.Parent.CalcUnscrolledPosition(pos.x, pos.y))

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   442

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        extern_rect = wx.Rect(left, top, right + HANDLE_SIZE - left, bottom + HANDLE_SIZE - top)

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        intern_rect = wx.Rect(left + HANDLE_SIZE, top + HANDLE_SIZE, right - left - HANDLE_SIZE, bottom - top - HANDLE_SIZE)

   445

   446

        # Verify that this element is selected

   447

        if self.Selected and extern_rect.Contains(pt.x, pt.y) and not intern_rect.Contains(pt.x, pt.y):

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            # Find if point is on a handle horizontally

   449

            if left <= pt.x < left + HANDLE_SIZE:

   450

                handle_x = 1

   451

            elif center <= pt.x < center + HANDLE_SIZE:

   452

                handle_x = 2

   453

            elif right <= pt.x < right + HANDLE_SIZE:

   454

                handle_x = 3

   455

            else:

   456

                handle_x = 0

   457

            # Find if point is on a handle vertically

   458

            if top <= pt.y < top + HANDLE_SIZE:

   459

                handle_y = 1

   460

            elif middle <= pt.y < middle + HANDLE_SIZE:

   461

                handle_y = 2

   462

            elif bottom <= pt.y < bottom + HANDLE_SIZE:

   463

                handle_y = 3

   464

            else:

   465

                handle_y = 0

   466

            # Verify that the result is valid

   467

            if (handle_x, handle_y) in VALID_HANDLES:

   468

                return handle_x, handle_y

   469

        return 0, 0

   470

   471

    # Method called when a LeftDown event have been generated

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    def OnLeftDown(self, event, dc, scaling):

   473

        # Test if an handle have been clicked

   474

        handle = self.TestHandle(event)

   475

        # Find which type of handle have been clicked,

   476

        # Save a resize event and change the cursor

   477

        cursor = HANDLE_CURSORS.get(handle, 1)

   478

        wx.CallAfter(self.Parent.SetCurrentCursor, cursor)

   479

        if cursor > 1:

   480

            self.Handle = (HANDLE_RESIZE, handle)

   481

        else:

   482

            self.Handle = (HANDLE_MOVE, None)

   483

            self.SetSelected(False)

   484

        # Initializes the last position

   485

        self.oldPos = GetScaledEventPosition(event, dc, scaling)

   486

        self.StartPos = wx.Point(self.Pos.x, self.Pos.y)

   487

        self.CurrentDrag = wx.Point(0, 0)

   488

   489

    # Method called when a LeftUp event have been generated

   490

    def OnLeftUp(self, event, dc, scaling):

   491

        # If a dragging have been initiated

   492

        if self.Dragging and self.oldPos:

   493

            self.RefreshModel()

   494

            self.Parent.RefreshBuffer()

   495

        wx.CallAfter(self.Parent.SetCurrentCursor, 0)

   496

        self.SetSelected(True)

   497

        self.oldPos = None

   498

   499

    # Method called when a RightDown event have been generated

   500

    def OnRightDown(self, event, dc, scaling):

   501

        pass

   502

   503

    # Method called when a RightUp event have been generated

   504

    def OnRightUp(self, event, dc, scaling):